Table 2 Means and standard deviation scores for the System Usability Scale

I think I would like to use the system frequently, mean ± SD

4.0 ± 1.1

3.6 ± 1.5

0.30

I found the system to be unnecessarily complex

1.3 ± 0.6

1.9 ± 1.3

0.06

I thought the system was easy to use

4.0 ± 1.3

4.2 ± 1.2

0.46

I think that I would need support of a technical person to be able to use the system

1.6 ± 1.2

1.6 ± 1.2

0.61

I found the various functions in the system were well integrated

4.5 ± 1.0

4.0 ± 1.2

0.07

I thought there was too much inconsistency in the system

1.8 ± 1.4

1.7 ± 1.3

0.78

I would imagine that most people would learn to use the system very quickly

4.3 ± 1.0

4.3 ± 1.1

0.54

I found the system very cumbersome to use

1.7 ± 1.1

1.7 ± 1.3

0.87

I felt very confident using the system

4.3 ± 0.8

4.3 ± 1.2

0.35

I needed to learn a lot of things before I could get going with the system

1.4 ± 0.7

1.3 ± 0.7

0.16

System Usability Scale total score (out of 100)

83.1 ± 13.9

80.7 ± 20.5

0.98